1910 EXTOMOLOGICAL SOCIETY. 107 



Host — Juneberry. 



Eriophyes sp. Small, nearly globular, dark brown, pocket galls, averaging 2 

 mm. in diameter, singly or in clusters on the upper side of the leaf. Juneberry 

 Ball Gall. Amelanchier rotundifolia. T. D. J., Guelph. 



Host — Maple. 



Eriophyes sp. A whitish frost-like erineum with scattered spots of rosy-pink, 

 on the upper surface of the leaf, sometimes nearly covering it. Acer rubrum. 

 T. D. J., Guelph. 



Eriophyes sp. A pale yellow or white erineum on the under side of the leaf. 

 Trichomes capitate. Acer saccharinum. T. D. J., Guelph. 



Phlcecoptes quadripes. A nearly spherical pocket gall on the upper surface nf 

 the leaf, varying from light green through red or purple to black. Acer sacchar- 

 inum. T. D. J., Guelph. 



Eriophyes sp. A white or whitish erineum in patches on the under side of the 

 leaf, often limited by the veins. Trichomes capitate. When old, the trichomes 

 assume a brown colour. Acer saccharum. T. D. J., Guelph. 



Phlcecoptes aceris. A green, Teddish or purplish, slender, pouch-gall project- 

 ing from the upper surface of the leaf, Acer saccharum. T. D. J., Guelph. 



Eriophyes sp. A white or whitish erineum on the under side of the leaf. Acer 

 nigrum. T. D. J., Guelph. 



Eriophyes sp. Irregular wart-like swellings (Dimple) on the upper surface 

 of the leaf. The swellings are green at first and turn gray when mature. The 

 average diameter is about 3 mm. Manitoba Maple Wart Gall. Acer negundo. 

 T. D. J., Guelph. 



Eriophyes sp. A white, whitish, or pale yellow erineum on the under side of 

 the leaf, in patches often in the axils of the veins. Trichomes long, tangled and 

 distorted. Acer spicatum. T. D. J., Guelph. 



Host — Oak. 



Eriophyes querci. An irregular dimple upon the blade of the leaf. From be- 

 neath it appears as an irregular cavity, lined with a tangled mass of white vegetable 

 hairs. Oak Dimple Gall. Quercus macrocarpa. T. D. J., Guelph. 



Eriophyes sp. A dense mat of brown hairs growing in large patches upon the 

 under side of the leaves. Oak Hair Gall. Quercus sp. T. D. J., Guelph. 



Host — Poplar. 



Eriophyes sp. Circular, fiat or slightly convex, frost-like patches varying from 

 2-3 mm. in diameter, on the upper side of the leaf. Large-toothed Aspen Frost 

 Gall. Populus grandidentata. T. D. J., Guelph. 



Eriophyes sp. Circular depressions dimple always on the lower side of the leaf. 

 On the upper side it appears as a reddish circular elevation. Large-toothed Aspen 

 Convex Gall. Populus grandidentata. T. D. J., Guelph. 



Eriophyes sp. Dimple-like galls en the upper side of the leaf of the Aspen. 

 Aspen Dimple Gall. Populus tremuloides. T. D. J., Guelph. 



Eriophyes sp. Irregular tubercular masses of closely-packed small reddish- 

 green protuberances on the stem. Unsightly Poplar Gall. Populus tremuloides. 



